TCP is important stuff for network engineers to know. Why? Today's problems aren't so cut-and-dry as they used to be. When a problem strikes, we can't just say "it's not the network" and go along with our day. A core understanding of TCP and how it carries and acknowledges data goes a long way …
Videos
How TCP Works – The Handshake
This video is the first in a series that explains how TCP works using Wireshark. The first step in a TCP Connection is establishing a Handshake. This video shows how TCP does its thing. https://youtu.be/HCHFX5O1IaQ …
Sharkfest 2017 – Winning the Network Blame Game
This session was recorded at Sharkfest 2017 - June 19th at Carnegie Mellon University in Pittsburgh. It delves into the reasons why people blame the network for performance problems, why these issues linger, and how network engineers can solve them using Wireshark. I hope this helps you in …
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Troubleshooting with Wireshark – Filtering Out What You Don’t Need
Sometimes packet digging can get tedious. We've all been there. It can be hard to set the right filter that lets us hone in on the root cause. In many cases, it is just as helpful to remove protocols from view that are not probably not related to the problem. At least that will give us …
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Troubleshooting with Wireshark – Finding Delays in TCP Conversations
The delta time column has always been one of the first things to add when configuring Wireshark. It shows the time between displayed packets, or captured packets, depending on how you set it up. It makes finding delays in conversations much easier to do - that is unless you are dealing with a trace …
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Wireshark – Spurious Retransmissions Explained
What is the difference between a regular retransmission and a spurious one? What can I do about them if I find them in a trace file? Spurious retransmissions are not uncommon. They find their way into our trace files somewhat often. In this video, we explain the differences in retransmission …
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